[19:42:58 INFO]: zuhir__ issued server command: /ajp blocks
[19:43:02 ERROR]: Could not pass event InventoryClickEvent to ajParkour v2.0.0-prerelease7
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1630) [Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) [Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) [Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_231]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_231]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_231]
Caused by: java.lang.NullPointerException
        at us.ajg0702.parkour.BlockSelector.onInvClick(BlockSelector.java:218) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_231]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_231]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[Spigot%20%5b1.8.8%5d.jar:git-Spigot-db6de12-18fbb24]
        ... 15 more